Study on Pre-treatment of the Domestic Sewage by Water-dropping Aeration Zeolite Bed Technology

[Objective] The research aimed to study pre-treatment effect of the domestic sewage by water-dropping aeration zeolite bed technology. [Method] By water-dropping aeration manner, we conducted sewage reoxygenation. Zeolite was used to replace traditional contact oxidization filler. We inspected oxygenation effect of the water-dropping aeration manner and removal efficiency of the pollutant in sewage after biological contact oxidation. [Result] Under the experimental condition with water-dropping heights of 0.30, 0.45 and 0.60 m, average added values of the dissolved oxygen for raw water were respectively 2.4, 3.6 and 4.2 mg/L after water-dropping aeration. Under the situation with average HRT of 2 h, when COD, TN and TP of the influent were respectively 309.0-464.0, 33.3-95.0 and 4.0-7.5 mg/L, their corresponding average removal rates were 47.25%, 46.39% and 40.75%. [Conclusion] The research conducted useful attempt for high-efficiency and low-cost treatment of the domestic sewage in rural area.